qml-language.qdoc

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// Copyright (C) 2026 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
 
/*!
\page qtqml-language-topic.html
\title The QML Language
\brief Overview of the QML language fundamentals
 
The QML language provides the foundation for building dynamic and declarative user interfaces.
This section covers the core language features and syntax.
 
\section1 Core Concepts
 
\section2 QML Basics
 
\l{QML Basics} introduces the fundamentals of QML, including object declarations,
property assignments, and hierarchical object structures. Understanding these basics is essential
for writing any QML code.
 
\section2 QML Documents
 
\l{QML Documents} explains how QML code is organized into files and the structure of a QML document.
Each document can define reusable types and includes imports, object declarations, and property
definitions.
 
\section2 Property Binding
 
\l{Property Binding} is one of QML's most powerful features, allowing properties to automatically
update when their dependencies change. Bindings create dynamic relationships between properties
without requiring imperative code.
 
\section2 Signal and Handler Event System
 
The \l{Signal and Handler Event System} provides QML's event handling mechanism. Objects can emit
signals when certain events occur, and other objects can respond by implementing signal handlers,
enabling loose coupling between components.
 
\section1 Import System
 
\section2 Import Statements
 
\l{Import Statements} allow you to include \l{QML Modules}, JavaScript files and ECMAScript modules
in your QML documents. They define what types and functionality are available within a document's
scope.
 
\l{Importing QML Document Directories} enables you to import all QML types from a directory without
explicitly defining a module. This is useful for sharing QML components within a project during
development.
 
\l{Importing JavaScript Resources in QML} explains how to include JavaScript files from the
JavaScript perspective. This includes importing into QML documents or into other JavaScript files.
 
\section1 Advanced Language Features
 
\section2 Property Shadowing and Override Semantics
 
\l{Property Shadowing and Override Semantics} describes what happens when derived types redefine
properties from their base types. Understanding these semantics is crucial for proper inheritance
and component customization.
 
\section2 Scope and Naming Resolution
 
\l{Scope and Naming Resolution} explains how QML resolves identifiers and properties in nested
object hierarchies. This includes understanding ID scopes, context properties, and the JavaScript
scope chain.
 
\section2 Resource Loading and Network Transparency
 
\l{Resource Loading and Network Transparency} shows how QML can load resources from local files
or network URLs using the same syntax. This allows seamless integration of remote content and
simplifies asset management.
 
\sa {The QML Reference}, {The QML Type System}
*/